People hit each other with pillows as they take part in the world's 6th annual Pillow Fight Day in Washington Square Park in New York on April 6, 2013. The massive pillow fight, which is the New York City's 8th annual, takes place in cities around the world. (Photo credit: TIMOTHY A. CLARY/AFP/Getty Images)

World Pillow Fight Day

A person in a rabbit costume takes part in the world's 6th annual Pillow Fight Day in Washington Square Park in New York on April 6, 2013. The massive pillow fight, which is the New York City's 8th annual, takes place in cities around the world. (Photo credit: TIMOTHY A. CLARY/AFP/Getty Images)

World Pillow Fight Day

People hit each other with pillows as they take part in the world's 6th annual Pillow Fight Day in Washington Square Park in New York on April 6, 2013. The massive pillow fight, which is the New York City's 8th annual, takes place in cities around the world. (Photo credit: TIMOTHY A. CLARY/AFP/Getty Images)

World Pillow Fight Day

People hit each other with pillows as they take part in the world's 6th annual Pillow Fight Day in Washington Square Park in New York on April 6, 2013. The massive pillow fight, which is the New York City's 8th annual, takes place in cities around the world. (Photo credit: TIMOTHY A. CLARY/AFP/Getty Images)

World Pillow Fight Day

People hit each other with pillows as they take part in the world's 6th annual Pillow Fight Day in Washington Square Park in New York on April 6, 2013. The massive pillow fight, which is the New York City's 8th annual, takes place in cities around the world. (Photo credit: TIMOTHY A. CLARY/AFP/Getty Images)

World Pillow Fight Day

People hit each other with pillows as they take part in the world's 6th annual Pillow Fight Day in Washington Square Park in New York on April 6, 2013. The massive pillow fight, which is the New York City's 8th annual, takes place in cities around the world. (Photo credit: TIMOTHY A. CLARY/AFP/Getty Images)

World Pillow Fight Day

People hit each other with pillows as they take part in the world's 6th annual Pillow Fight Day in Washington Square Park in New York on April 6, 2013. The massive pillow fight, which is the New York City's 8th annual, takes place in cities around the world. (Photo credit:TIMOTHY A. CLARY/AFP/Getty Images)

World Pillow Fight Day

People hit each other with pillows as they take part in the world's 6th annual Pillow Fight Day in Washington Square Park in New York on April 6, 2013. The massive pillow fight, which is the New York City's 8th annual, takes place in cities around the world. (Photo credit:TIMOTHY A. CLARY/AFP/Getty Images)

World Pillow Fight Day

People hit each other with pillows as they take part in the world's 6th annual Pillow Fight Day in Washington Square Park in New York on April 6, 2013. The massive pillow fight, which is the New York City's 8th annual, takes place in cities around the world. (Photo credit:TIMOTHY A. CLARY/AFP/Getty Images)

World Pillow Fight Day

People enjoy the mass pillow fight event on Maria-Theresien-Square in Vienna, Austria on April 6, 2013, the International Pillow Fight Day. (Photo credit: ALEXANDER KLEIN/AFP/Getty Images)

Young people enjoy the mass pillow fight event in Vienna, Austria on April 6, 2013, the International Pillow Fight Day. (Photo credit: ALEXANDER KLEIN/AFP/Getty Images)

World Pillow Fight Day

Feathers fly around while people take part in the mass pillow fight event in Vienna, Austria on April 6, 2013, the International Pillow Fight Day. (Photo credit: ALEXANDER KLEIN/AFP/Getty Images)

World Pillow Fight Day

Feathers fly around while people take part in the mass pillow fight event in Vienna, Austria on April 6, 2013 as part of the International Pillow Fight Day. (Photo credit: ALEXANDER KLEIN/AFP/Getty Images)

World Pillow Fight Day

Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day. Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day. (Photo credit: CARL COURT/AFP/Getty Images)

World Pillow Fight Day

Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day. (Photo credit: CARL COURT/AFP/Getty Images)

World Pillow Fight Day

Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day. (Photo credit: CARL COURT/AFP/Getty Images)

World Pillow Fight Day

Revellers takeRevellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day. (Photo credit: CARL COURT/AFP/Getty Images)

World Pillow Fight Day

Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day. (Photo credit: CARL COURT/AFP/Getty Images)

World Pillow Fight Day

Revellers take part in a mass pillow fight in Trafalgar Square in central London on April 6, 2013 on International Pillow Fight Day. (Photo credit: CARL COURT/AFP/Getty Images)

World Pillow Fight Day

People take part in a pillow fight in front of the Saint-Lazare train station on April 6, 2013 in Paris. International Pillow Fight Day was launched in 2008. (Photo credit: FRED DUFOUR/AFP/Getty Images)

World Pillow Fight Day

People take part in a pillow fight in front of the Saint-Lazare train station on April 6, 2013 in Paris. International Pillow Fight Day was launched in 2008. (Photo credit: FRED DUFOUR/AFP/Getty Images)